The United Nations (UN) is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and the achieving of world peace. The UN was founded in 1945 after World War II to replace the League of Nations, to stop wars between countries, and to provide a platform for dialogue. It contains multiple subsidiary organizations to carry out its missions.

There are currently 192 member states, including nearly every sovereign state in the world. From its offices around the world, the UN and its specialized agencies decide on substantive and administrative issues in regular meetings held throughout the year. The organization is divided into administrative bodies, primarily: the General Assembly (the main deliberative assembly); the Security Council (decides certain resolutions for peace and security); the Economic and Social Council (assists in promoting international economic and social cooperation and development); the Secretariat (provides studies, information, and facilities needed by the UN); the International Court of Justice (the primary judicial organ).

Additional bodies deal with the governance of all other UN System agencies, such as the World Health Organization (WHO), the World Food Programme (WFP) and United Nations Children's Fund (UNICEF). The UN's most visible public figure is the Secretary-General, currently Ban Ki-moon of South Korea, who attained the post in 2007. The organization is financed from assessed and voluntary contributions from its member states, and has six official languages: Arabic, Chinese, English, French, Russian, and Spanish.

Following in the wake of the failed League of Nations (1919–1946), which the United States never joined, the United Nations was established in 1945 to maintain international peace and promote cooperation in solving international economic, social and humanitarian problems. The earliest concrete plan for a new world organization was begun under the aegis of the U.S. State Department in 1939. Franklin D.

Roosevelt first coined the term 'United Nations' as a term to describe the Allied countries. The term was first officially used on January 1, 1942 when 26 governments signed the Atlantic Charter, pledging to continue the war effort. On 25 April 1945, the UN Conference on International Organization began in San Francisco, attended by 50 governments and a number of non-governmental organizations involved in drafting the Charter of the United Nations.

The UN officially came into existence on 24 October 1945 upon ratification of the Charter by the five permanent members of the Security Council—France, the Republic of China, the Soviet Union, the United Kingdom and the United States—and by a majority of the other 46 signatories. The first meetings of the General Assembly, with 51 nations represented, and the Security Council, took place in Westminster Central Hall in London in January 1946.

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